/*
 * Copyright (c) 2017 - 2020, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 *   This file implements the pseudo-random number generator abstraction layer.
 *
 * This pseudo-random number abstraction layer uses standard library rand() function.
 *
 */

#include "nrf_802154_random.h"

#include <stdlib.h>
#include <stdint.h>

#include "nrf.h"

#if RAAL_SOFTDEVICE

#if defined (__GNUC__)
_Pragma("GCC diagnostic push")
_Pragma("GCC diagnostic ignored \"-Wreturn-type\"")
_Pragma("GCC diagnostic ignored \"-Wunused-parameter\"")
_Pragma("GCC diagnostic ignored \"-Wpedantic\"")
#endif

#include <nrf_soc.h>

#if defined (__GNUC__)
_Pragma("GCC diagnostic pop")
#endif

#endif // RAAL_SOFTDEVICE

void nrf_802154_random_init(void)
{
    uint32_t seed;

#if RAAL_SOFTDEVICE
    uint32_t result;

    do
    {
        result = sd_rand_application_vector_get((uint8_t *)&seed, sizeof(seed));
    }
    while (result != NRF_SUCCESS);
#else // RAAL_SOFTDEVICE
    NRF_RNG->TASKS_START = 1;

    while (!NRF_RNG->EVENTS_VALRDY);
    NRF_RNG->EVENTS_VALRDY = 0;
    NRF_RNG->TASKS_STOP    = 1;

    seed = NRF_RNG->VALUE;
#endif // RAAL_SOFTDEVICE

    srand((unsigned int)seed);
}

void nrf_802154_random_deinit(void)
{
    // Intentionally empty
}

uint32_t nrf_802154_random_get(void)
{
    return (uint32_t)rand();
}
